From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Steven Allen via "Bug reports for GNU Emacs, the Swiss army knife of text editors" Newsgroups: gmane.emacs.bugs Subject: bug#72323: 31.0.50; line-move unconditionally resets vscroll to 0 Date: Sun, 18 Aug 2024 11:40:42 -0700 Message-ID: <871q2l3c9h.fsf@stebalien.com> References: <87zfq2hg4n.fsf@stebalien.com> <86ikwq1z92.fsf@gnu.org> <87v80qha04.fsf@stebalien.com> <86cymy15n2.fsf@gnu.org> <877cd59t76.fsf@stebalien.com> <86jzh4zc2w.fsf@gnu.org> <877ccd3f56.fsf@stebalien.com> <86wmkdy9mx.fsf@gnu.org> Reply-To: Steven Allen Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="12535"; mail-complaints-to="usenet@ciao.gmane.io" Cc: luangruo@yahoo.com, 72323@debbugs.gnu.org, storm@cua.dk To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Aug 18 20:41:34 2024 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1sfkqL-00034T-NT for geb-bug-gnu-emacs@m.gmane-mx.org; 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Sun, 18 Aug 2024 14:40:45 -0400 (EDT) In-Reply-To: <86wmkdy9mx.fsf@gnu.org> X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:290349 Archived-At: Eli Zaretskii writes: >> From: Steven Allen >> Cc: luangruo@yahoo.com, 72323@debbugs.gnu.org, storm@cua.dk >> Date: Sun, 18 Aug 2024 10:38:29 -0700 >> >> Eli Zaretskii writes: >> >> > Once again: the vscroll value is pertinent only for the screen line >> > for which it was computed, because the way it is computed uses the >> > metrics of that line. Once you move to another line, the value is no >> > longer pertinent. >> >> Let's be precise about "move to another line": >> >> - When window-start changes, vscroll becomes invalid because the lines at >> the top of the screen (to which vscroll applies) has changed. I agree >> that it must be reset in this case. >> - When point is moved up and down in such a way that window-start isn't >> changed, vscroll is still perfectly valid as the top line in the >> window hasn't changed. > > I disagree. When point moves to another screen line without moving > window-start, vscroll may or may not be valid. Whether it is depends > on the details of what is on display. Can you give me an example example where moving point invalidates vscroll (except when point would move partially or fully off screen)?